[GHC] #12172: User's Guide patches

[GHC]

#12172: User's Guide patches
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        Reporter:  thomie            |                Owner:
            Type:  task              |               Status:  merge
        Priority:  normal            |            Milestone:  8.0.2
       Component:  Documentation     |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Documentation     |  Unknown/Multiple
  bug                                |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Thomas Miedema <thomasmiedema@…>):

 In [changeset:"c22ab1a6d72bc03a6c459d7b6991730b5b1d9b1f/ghc"
 c22ab1a6/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="c22ab1a6d72bc03a6c459d7b6991730b5b1d9b1f"
 Docs: delete PatternGuards documentation

 Since `-XPatternGuards` is enabled by default, invert the logic and
 mention `-XNoPatternGuards` first.

 Also, since this is a Haskell 2010 feature, refer to the language report
 instead of explaining it.

 In general, I would like to follow the guideline of assuming the latest
 language report as a given, and then only report GHC's deviations and
 extensions relative to that report.

 Reviewed by: bgamari

 Differential Revision: https://phabricator.haskell.org/D2319

 GHC Trac Issues: #12172
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12172#comment:2>
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